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| {{STRUCTURE_1c5k| PDB=1c5k | SCENE= }} | | {{STRUCTURE_1c5k| PDB=1c5k | SCENE= }} |
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| '''THE STRUCTURE OF TOLB, AN ESSENTIAL COMPONENT OF THE TOL-DEPENDENT TRANSLOCATION SYSTEM AND ITS INTERACTIONS WITH THE TRANSLOCATION DOMAIN OF COLICIN E9'''
| | ===THE STRUCTURE OF TOLB, AN ESSENTIAL COMPONENT OF THE TOL-DEPENDENT TRANSLOCATION SYSTEM AND ITS INTERACTIONS WITH THE TRANSLOCATION DOMAIN OF COLICIN E9=== |
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| ==Overview==
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| BACKGROUND: E colicin proteins have three functional domains, each of which is implicated in one of the stages of killing Escherichia coli cells: receptor binding, translocation and cytotoxicity. The central (R) domain is responsible for receptor-binding activity whereas the N-terminal (T) domain mediates translocation, the process by which the C-terminal cytotoxic domain is transported from the receptor to the site of its cytotoxicity. The translocation of enzymatic E colicins like colicin E9 is dependent upon TolB but the details of the process are not known. RESULTS: We have demonstrated a protein-protein interaction between the T domain of colicin E9 and TolB, an essential component of the tol-dependent translocation system in E. coli, using the yeast two-hybrid system. The crystal structure of TolB, a procaryotic tryptophan-aspartate (WD) repeat protein, reveals an N-terminal alpha + beta domain based on a five-stranded mixed beta sheet and a C-terminal six-bladed beta-propeller domain. CONCLUSIONS: The results suggest that the TolB-box residues of the T domain of colicin E9 interact with the beta-propeller domain of TolB. The protein-protein interactions of other beta-propeller-containing proteins, the yeast yPrp4 protein and G proteins, are mediated by the loops or outer sheets of the propeller blades. The determination of the three-dimensional structure of the T domain-TolB complex and the isolation of mutations in TolB that abolish the interaction with the T domain will reveal fine details of the protein-protein interaction of TolB and the T domain of E colicins.
| | The line below this paragraph, {{ABSTRACT_PUBMED_10673426}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 10673426 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_10673426}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Colicin import]] | | [[Category: Colicin import]] |
| [[Category: Protein-protein interaction]] | | [[Category: Protein-protein interaction]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 12:21:15 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 20:14:29 2008'' |
